怎样判断二极管的极性?
参考答案:1)根据二极管壳上标志的符号来判别二极管的极性;2)根据二极管正向电阻小、反向电阻大的特点,用万用表来判别二极管的极性。
The little girl was ________ losing her life, but she is now ________. [ ]
A. in the danger of; out of danger
B. in danger of; out of the danger
C. in the danger of; out of the danger
D. in danger of; out of danger
有两种理想气体,第一种的压强记做p1,体积记做V1,温度记做T1,总质量记做m1,摩尔质量记做M1;第二种的压强记做p2,体积记做V2,温度记做T2,总质量记做m2,摩尔质量记做M2。当V1=V2,T1=T2,m1=m2时,则M1/M2为()。
A.A
B.B
C.C
D.D